Required Strength Model and Influence Factors of Stage Backfill-Pillar with Double Exposed Faces

doi:10.12068/j.issn.1005-3026.2018.09.022

Abstract

Abstract: Stage backfill-pillar with double exposed faces subjected to biaxial loads is prone to shear failure. In order to determine the required strength of backfill reasonably， Terzaghi theory on loosing earth pressure and limit equilibrium theory of sliding wedge were used to build a required strength model of stage backfill-pillar. Influencing factors for the required strength of stage backfill-pillar were analysed. The results show that stope depth and structure parameters have a positive effect on the required strength of stage backfill-pillar， while internal friction angle of backfill， and the coefficient of friction and angle between backfill and surrounding rock have a negative effect on it. The results are of great practical significance in guiding backfilling ratio， preventing ground subsidence and protecting the environment.

Key words: stage subsequent filling mining, backfill-pillar, required strength, mathematical model, wedge model

CLC Number:

TU863

YANG Lei ， QIU Jing-ping， SUN Xiao-gang， XING Jun. Required Strength Model and Influence Factors of Stage Backfill-Pillar with Double Exposed Faces[J]. Journal of Northeastern University Natural Science, 2018, 39(9): 1327-1331.

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